WO2011138959A1 - Ptcデバイスおよびそれを有する2次電池 - Google Patents
Ptcデバイスおよびそれを有する2次電池 Download PDFInfo
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- WO2011138959A1 WO2011138959A1 PCT/JP2011/060582 JP2011060582W WO2011138959A1 WO 2011138959 A1 WO2011138959 A1 WO 2011138959A1 JP 2011060582 W JP2011060582 W JP 2011060582W WO 2011138959 A1 WO2011138959 A1 WO 2011138959A1
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- WIPO (PCT)
- Prior art keywords
- ptc
- ptc device
- secondary battery
- ptc element
- lead
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/008—Thermistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/02—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient
- H01C7/021—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material having positive temperature coefficient formed as one or more layers or coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/34—Gastight accumulators
- H01M10/345—Gastight metal hydride accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
- H01M2200/106—PTC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present invention relates to a PTC device and an electric device including the PTC device, for example, a secondary battery.
- Polymer PTC elements comprising a layered polymer PTC element comprising a conductive filler and a polymer material and metal electrodes disposed on both sides of the layered polymer PTC element are used in various electrical devices.
- a PTC element is used as a circuit protection element in a circuit that charges the secondary battery.
- the PTC element is disposed in the protection circuit via the lead, and the PTC device having the PTC element and the lead and the protection circuit are disposed outside the positive electrode terminal of the secondary battery, and these are integrated into the electric circuit. It constitutes a device and is used as a so-called “battery pack”. Since the electric device has a built-in battery pack, if the built-in battery pack can be made more compact, the electric device can be made more compact.
- various secondary batteries of dry cell type are used.
- the secondary batteries for example, in the case of the AA type or the AA type, there is a restriction on increasing the volume occupied by the AA type or the AA type.
- a nickel metal hydride battery is schematically shown in a sectional view in FIG. 1 so that the internal structure thereof can be understood.
- nickel hydroxide is used for the positive electrode 102
- a hydrogen storage alloy is used for the negative electrode 104
- a separator and an electrolytic solution exist between these electrodes.
- hydrogen occluded in the alloy releases electrons, and hydrogen ions move from the negative electrode to the positive electrode in the electrolyte.
- the positive electrode is connected to the positive electrode tab 106, which is connected to the positive electrode terminal 110 through the sealing plate 108.
- the electrolyte used is based on alkali and contains a potassium salt such as potassium hydroxide.
- a potassium salt such as potassium hydroxide.
- various salts such as sodium and lithium may be used.
- alkalis are generally corrosive, and the positive electrode tab will be exposed to such an alkaline atmosphere. Therefore, it is necessary to select a material having resistance to corrosion by alkali as a material used for the positive electrode tab.
- nickel is used as a material for the positive electrode tab. Nickel is resistant to corrosion as a result of forming a non-moving body in an alkaline atmosphere.
- the electric device such as a PTC device, a battery pack having a PTC device and a secondary battery, and a dry battery type secondary battery more compact
- a dry cell type secondary battery if the PTC device can be arranged in a space 112 in which the positive electrode tab 106 exists (this space may also be referred to as “positive electrode tab space” in this specification), 2 It was conceived that the volume of the secondary battery can be further reduced. In addition, in the battery pack, it has been conceived that the volume of the battery pack can be further reduced if the PTC device arranged outside the secondary battery can be arranged inside the secondary battery.
- the present invention provides: (1) (A) (a1) a conductive filler, and (a2) a layered polymer PTC element comprising a polymer material, (B) a PTC element comprising metal electrodes disposed on both sides of the polymer PTC element, and (2) at least a portion located on the metal electrode of the PTC element and connected to the metal electrode by a conductive material.
- the PTC device is characterized in that the exposed portion of the conductive material is covered with a protective member including a material capable of absorbing or including alkali.
- PTC elements are well known, and such PTC elements can also be used in the present invention.
- the lead is an element necessary for electrically connecting the PTC element to a predetermined circuit, and is itself well known.
- a lead for example, a nickel lead, a nickel-plated stainless steel lead, a nickel -An iron alloy (Kovar) lead or the like can be used.
- the conductive material that connects each metal electrode and each lead of the PTC element is not particularly limited as long as it is a material that can electrically connect them, but in the present invention, such a conductive material is also used.
- solder, solder paste, conductive adhesive, or the like can be used.
- the present invention is useful when such a conductive material is corroded by an electrolyte solution constituting a battery, particularly an alkali component contained therein, for example, an alkali metal salt such as sodium, potassium, lithium, and / or ions. This is a case where there is a possibility of being adversely affected.
- a conductive material includes, for example, tin, zinc, lead and the like.
- the present invention is particularly useful when using, as the conductive material, solder, particularly lead-free solder, such as tin, silver and copper alloy solder, tin and bismuth alloy solder, tin and indium alloy solder, and the like.
- a material capable of absorbing or including alkali means a material capable of temporarily or permanently taking in salts and / or ions of alkali metals (particularly sodium, potassium and / or lithium).
- alkali metals particularly sodium, potassium and / or lithium.
- Such materials are variously known, and examples thereof include crown ethers having a specific structure and / or functional group (for example, cyclodextrin), glymes and the like.
- JP-A-6-28914 polymer having a crown ether as a side chain
- JP-A-2003-187864 glyme, crown ether
- JP-A-2002-241376 crown ether
- JP-A 2003-2003 No. 249367 crown ether
- Japanese Patent Application Laid-Open No. 2005-63871 crown ether
- Japanese Patent Application Laid-Open No. 6-13110 glyme, crown ether, cryptand
- alkali metal such as lithium, potassium and sodium.
- Materials that trap ions and / or salts are disclosed.
- various organic polymers that form various crown ether structures and have various functional groups in side chains as required are disclosed.
- Such a “material capable of absorbing or including alkali” may be capable of forming a protective member alone on the exposed portion of the conductive material, but other components (for example, a shaping material such as a resin) may be used as necessary. Agent, solvent or plasticizer).
- the protective member may be in any suitable form.
- the protective member may be in the form of a protective coating, for example. In that case, the above-described simple substance or mixture is applied by, for example, brushing or spraying according to the form of the simple substance or the mixture so as to cover the exposed portion.
- a film may be obtained from a single substance or a mixture as described above, and the PTC element may be wrapped with this film so that only the end portion of the lead protrudes. That is, the protective member may be in the form of a film that wraps the PTC element.
- the PTC element including the exposed part is mostly molded by insert molding in which the molten PTC element is placed in the mold and the molten simple substance or mixture is injected into the mold. You may be surrounded by. That is, the protective member may be a single member or a mixture molded member surrounding the PTC element as described above.
- the PTC device of the present invention is arranged such that “a material capable of absorbing or including alkali” covers at least a part of the periphery of the PTC element. That is, such a portion may or may not be an exposed portion of the conductive material as described above. In a preferred embodiment, at least the exposed portion is covered with such material. For example, substantially only the exposed portion, or the exposed portion and surrounding portions are covered with such material.
- the protective member may cover substantially all of the PTC element and the lead except for the end portion of the lead.
- the above-mentioned single-piece or mixture-like granular material or film piece is at least part of the surface of the PTC element, preferably the exposed part of the conductive material or its vicinity, or the exposed part.
- the PTC element and the granular material or small piece arranged on the PTC element are arranged so that the granular material (or powder) or small piece arranged in the vicinity thereof does not move. Wrapped together with a thin film of an inert resin (however, the end portion of the lead protrudes from the entrained film).
- the alkali of the electrolyte approaching the PTC element can be captured and prevented from coming into contact with the conductive material, so that it is possible to prevent the alkali from adversely affecting the PTC device.
- Such various PTC devices of the present invention can be arranged inside the secondary battery, particularly in the positive electrode tab space, and function as the positive electrode tab. Therefore, this invention provides the secondary battery as an electric device in the 2nd summary.
- a secondary battery may be a dry battery type.
- the battery pack may include a PTC device on the outside.
- this invention also provides the other electric device containing such a PTC device.
- the secondary battery includes a positive electrode, a negative electrode, and a separator and an electrolyte disposed between the positive electrode, the PTC device of the present invention, and more specifically, a lead of the PTC device between the positive electrode and the positive electrode terminal.
- a secondary battery of the present invention is of a dry battery type, but as described above, in another aspect, the secondary battery of the present invention has a protection circuit and the PTC device of the present invention outside the secondary battery. It may be in the form of a battery pack.
- the exposed portion of the conductive material that is susceptible to corrosion by alkali contained in the electrolyte is covered with a protective member of “a material that can absorb or include alkali”. Even when placed in an alkaline atmosphere, the protective member absorbs and / or includes alkali, so that it is possible to prevent the alkali from substantially reaching the conductive material, and as a result, the conductive material, and therefore the PTC. The influence of corrosion of the element due to alkali can be minimized.
- the PTC device adversely affects the PTC device and minimizes the PTC device. Can function as a circuit protection element.
- the PTC device of the present invention can be disposed in the positive electrode tab space of the secondary battery described above.
- a sectional view of a rechargeable battery showing an internal structure typically is shown.
- the PTC device of one mode of the present invention is typically shown with a sectional view.
- the PTC device of another mode of the present invention is typically shown with a sectional view.
- the PTC device of another mode of the present invention is typically shown with a sectional view.
- the secondary battery shown in FIG. 1 which has the PTC device of this invention is shown with sectional drawing.
- the illustrated PTC device 10 includes a layered polymer PTC element 12 comprising a conductive filler and a polymer material, PTC elements having metal electrodes (eg, metal foil electrodes) 18 and 20 on both surfaces 14 and 16 of the polymer PTC element. 22 and leads 24 and 26.
- PTC elements having metal electrodes (eg, metal foil electrodes) 18 and 20 on both surfaces 14 and 16 of the polymer PTC element. 22 and leads 24 and 26.
- the lead 24 is electrically connected to a part of the metal electrode 18 by a conductive material 28, and the lead 26 is electrically connected to the whole of the metal electrode 20 by a conductive material 30.
- the conductive material has a portion that is exposed at the side surface portion 32 when the protective member is not present.
- a protective member as a protective coating 34 including a material that can absorb or include alkali.
- the protective coating may take any form, and in the embodiment shown in FIG. 2, the side portion as the exposed portion of the conductive material and the relatively narrow area on the upper side and / or the lower side thereof are covered with the protective coating. Yes.
- a protective coating may be applied by brushing, spraying, etc.
- a protective coating-forming material for example, a solution or dispersion comprising a material capable of absorbing or encapsulating alkali
- the protective coating may cover substantially all of the PTC element and the lead except for the end portion of the lead. In that case, the protective coating may be in a form substantially similar to the film (58, 60) of FIG.
- FIG. 3 schematically shows a PTC device according to another aspect of the present invention.
- the PTC device 40 comprises a PTC element 42 and leads 44 and 46 on both sides, the PTC device having a molding member 48 around it.
- the PTC element 42 is illustrated as a whole, and the illustration of the conductive material positioned between the PTC element 42 and the leads 44 and 46 is omitted.
- Such a device performs injection molding in which a PTC element connected with a lead is inserted into a mold, and thereafter a molding material containing a material capable of absorbing or including alkali is injected into the mold and solidified.
- the exposed surface of the PTC element 42 including the exposed portion of the conductive material can be manufactured by forming the molding member 48 as a protective member.
- the end portion of the lead protrudes from the molded member. Therefore, it is necessary to insert into the mold so that a molded member is not formed at the end portion of the lead of the PTC element at the time of injection molding.
- FIG. 4 shows a PTC device 50 according to another aspect of the present invention.
- the PTC device includes a PTC element 52 and leads 54 and 56 on both sides, with the end portions of the leads 54 and 56 protruding, and the PTC element between the two films 58 and 60. Is sandwiched.
- the films 58 and 60 cover the exposed surface of the exposed portion of the PTC element and lead (except for the end portion thereof), including the exposed portion of the conductive material, and the PTC of the present invention. It can function as a protective member of the device.
- the PTC element 52 is illustrated as a whole for the sake of simplicity, and the illustration of the conductive material positioned between the PTC element 52 and the leads 54 and 56 is omitted. ing.
- a PTC element having a lead electrically connected by a conductive material is sandwiched between two films with an end portion of the lead protruding from the film. It can be manufactured by pressing the film together.
- FIG. 5 schematically shows the secondary battery of the present invention incorporating the PTC device of the present invention, as in FIG.
- the secondary battery 70 has the PTC device 74 of the present invention in the positive electrode tab space 72, one end of one lead 76 is connected to the positive electrode terminal 80 through the sealing plate 78, and the other lead 82 is connected to the positive electrode 84.
- the PTC device of the present invention is arranged instead of the positive electrode tab, other parts of the secondary battery of the present invention may be the same as those of known secondary batteries.
- the secondary battery of the present invention has a protection circuit outside thereof, and includes the PTC device of the present invention disposed outside the secondary battery, for example, outside the positive electrode terminal.
- the PTC device is disposed in the protection circuit, and the PTC device functions as a unit to protect the secondary battery, and the secondary battery, the PTC device, and the protection circuit include the battery. Configure the pack. As described above, even when the PTC device is arranged outside the secondary battery, when the electrolyte in the secondary battery slightly leaks, an adverse effect on the conductive material by the electrolyte can be suppressed.
- the PTC device of the present invention is disposed in an extra space inside the secondary battery, the influence of the electrolyte in the battery can be minimized.
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Abstract
Description
(1)(A)(a1)導電性フィラー、及び
(a2)ポリマー材料
を含んで成る層状ポリマーPTC要素、
(B)ポリマーPTC要素の両側の表面に配置された金属電極
を有して成るPTC素子、ならびに
(2)少なくとも一部分がPTC素子の金属電極上に位置し、導電性材料によって金属電極に接続されたリード
を有して成り、上記導電性材料の露出部分は、アルカリを吸収または包接できる材料を含んで成る保護部材によって覆われていることを特徴とするPTCデバイスを提供する。
また、PTC素子の各金属電極と各リードとを接続する導電性材料は、これらを電気的に接続できる材料であれば、特に限定されるものではないが、本発明においても、そのような導電性材料を用いることができる。例えば、ハンダ、ハンダペースト、導電性接着剤等を使用できる。
本発明の1つの態様のPTCデバイスを図2に示す。図示したPTCデバイス10は、導電性フィラー及びポリマー材料を含んで成る層状ポリマーPTC要素12、ポリマーPTC要素の両側の表面14および16上に金属電極(例えば金属箔電極)18および20を有するPTC素子22ならびにリード24および26を有して成る。
18,20…金属電極、22…PTC素子、24,26…リード、
28,30…導電性材料、32…側面部、34…保護コーティング、
40…PTCデバイス、42…PTC素子、44,46…リード、48…成形部材、
50…PTCデバイス、52…PTC素子、54,56…リード、
58,60…フィルム、70…2次電池、72…正極タブ空間、
74…PTCデバイス、76…リード、78…封口板、80…正極端子、
82…リード、100…ニッケル水素電池、102…正極、104…負極、
106…正極タブ、108…封口板、110…正極端子。
Claims (8)
- (1)(A)(a1)導電性フィラー、及び
(a2)ポリマー材料
を含んで成る層状ポリマーPTC要素、及び
(B)ポリマーPTC要素の両側の表面に配置された金属電極
を有して成るPTC素子、ならびに
(2)少なくとも一部分がPTC素子の金属電極上に位置し、導電性材料によって金属電極に接続されたリード
を有して成り、上記導電性材料の露出部分は、アルカリを吸収または包接できる材料を含んで成る保護部材によって覆われていることを特徴とするPTCデバイス。 - 導電性材料は、錫を含んで成る請求項1に記載のPTCデバイス。
- アルカリを吸収または包接できる材料は、クラウンエーテル類である請求項1または2に記載のPTCデバイス。
- 保護部材は、リードの端部分が突出した状態でPTC素子およびリードの残りの部分を包囲する成形部材の形態である請求項1~3のいずれかに記載のPTCデバイス。
- 保護部材は、リードの端部分が突出した状態でPTC素子およびリードの残りの部分を包囲するフィルムの形態である請求項1~3のいずれかに記載のPTCデバイス。
- 正極、負極、これらの間に配置されたセパレータおよび電解液を有して成り、正極と正極端子との間で請求項1~5のいずれかに記載のPTCデバイスが配置されていることを特徴とする2次電池。
- PTCデバイスが正極タブ空間内に配置されている、乾電池型である請求項6に記載の2次電池。
- 保護回路と共にPTCデバイスが外側に配置されている、電池パックの形態である請求項6に記載の2次電池。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/696,589 US20130202917A1 (en) | 2010-05-06 | 2011-05-06 | PTC Device and Secondary Battery Equipped with Same |
JP2012513830A JP5816167B2 (ja) | 2010-05-06 | 2011-05-06 | Ptcデバイスおよびそれを有する2次電池 |
EP11777478.6A EP2568519A4 (en) | 2010-05-06 | 2011-05-06 | PTC DEVICE AND SECONDARY BATTERY COMPRISING SAME |
KR1020127032004A KR20130112704A (ko) | 2010-05-06 | 2011-05-06 | Ptc 디바이스 및 그것을 갖는 2차 전지 |
CN2011800328699A CN103238236A (zh) | 2010-05-06 | 2011-05-06 | Ptc装置和配备有ptc装置的二次电池 |
Applications Claiming Priority (2)
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JP2010106343 | 2010-05-06 | ||
JP2010-106343 | 2010-05-06 |
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WO2011138959A1 true WO2011138959A1 (ja) | 2011-11-10 |
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PCT/JP2011/060582 WO2011138959A1 (ja) | 2010-05-06 | 2011-05-06 | Ptcデバイスおよびそれを有する2次電池 |
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US (1) | US20130202917A1 (ja) |
EP (1) | EP2568519A4 (ja) |
JP (1) | JP5816167B2 (ja) |
KR (1) | KR20130112704A (ja) |
CN (1) | CN103238236A (ja) |
WO (1) | WO2011138959A1 (ja) |
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JP2012054099A (ja) * | 2010-09-01 | 2012-03-15 | Fdk Twicell Co Ltd | 電池 |
JP2012054098A (ja) * | 2010-09-01 | 2012-03-15 | Fdk Twicell Co Ltd | アルカリ蓄電池 |
JP2016021338A (ja) * | 2014-07-15 | 2016-02-04 | Fdk株式会社 | 正極リード、アルカリ二次電池 |
EP2927995B1 (en) * | 2012-11-30 | 2018-05-30 | FDK Corporation | Positive electrode lead and alkaline secondary battery |
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CN106992322B (zh) * | 2016-01-20 | 2023-12-05 | 瑞侃电子(上海)有限公司 | 电池芯内部用保护装置 |
US10186356B2 (en) * | 2016-07-06 | 2019-01-22 | Littelfuse, Inc. | Flexible positive temperature coefficient sheet and method for making the same |
KR20190035762A (ko) | 2016-08-15 | 2019-04-03 | 리텔퓨즈 인코퍼레이티드 | 배터리 관리 시스템을 구비한 플렉서블 정온도 계수 장치 |
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- 2011-05-06 JP JP2012513830A patent/JP5816167B2/ja not_active Expired - Fee Related
- 2011-05-06 EP EP11777478.6A patent/EP2568519A4/en not_active Withdrawn
- 2011-05-06 WO PCT/JP2011/060582 patent/WO2011138959A1/ja active Application Filing
- 2011-05-06 KR KR1020127032004A patent/KR20130112704A/ko not_active Application Discontinuation
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JP2012054099A (ja) * | 2010-09-01 | 2012-03-15 | Fdk Twicell Co Ltd | 電池 |
JP2012054098A (ja) * | 2010-09-01 | 2012-03-15 | Fdk Twicell Co Ltd | アルカリ蓄電池 |
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Also Published As
Publication number | Publication date |
---|---|
CN103238236A (zh) | 2013-08-07 |
JPWO2011138959A1 (ja) | 2013-07-22 |
KR20130112704A (ko) | 2013-10-14 |
JP5816167B2 (ja) | 2015-11-18 |
US20130202917A1 (en) | 2013-08-08 |
EP2568519A4 (en) | 2016-01-06 |
EP2568519A1 (en) | 2013-03-13 |
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